The world’s first completely automatic railway has been built under the busy streets of London．(1) ___________________________________________．The new Victoria Line was opened in 1969．This new line was very different from the others．The stations on the other lines need a lot of workers to sell tickets．and to check and to collect them when people leave the trains．This is all different on the Victoria Line．Here a machine checks and collects the tickets，and there are no workers on the platform．On the train，there is only one worker．If necessary，this man can drive the train．But usually he just starts it；and it runs and stops by itself．(2) ________________________________．The command spots are the same distance apart．Each sends a certain signal．The train always moves at the speed that the command spots allow．If the command spot sends no signals, the train will stop．Most of the control work is done by computers．The computers also fix the train’s speeds，and send the signals to the command spots．Other machines make sure that the trains are always a safe distance apart.(3) __________________________.So there is no danger of accidents on the line．
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作者: lyl1242000 时间: 2012-12-9 10:18
1作者: susan.sui 时间: 2012-12-10 13:45
the railway is called the Victoria Line and it is the part of complete London underground railway.
the train is controlled by electrical signals which are sent by the so called command spots.
one train may stay too long at a station, the other trains will then automatically move slower.作者: 差不多小姐 时间: 2012-12-14 17:50
~~作者: riverfeng 时间: 2012-12-16 19:50
1.The railway is called Victoria Line and it's really closed the underground railway
2.Between control by automatic ...which send by so-called the command spots
3.One train may two.. at station..other train was move slower
